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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

27600 results found.

  1. GRB 101011A: Swift detection of a burst
  2. GRB 101008A: Fermi GBM observation
  3. GRB 101008A: MASTER prompt optical observations
  4. GRB 101008A: Swift-BAT refined analysis
  5. GRB101008A, GROND detection of a fading afterglow
  6. GRB 101008A: Swift-XRT refined analysis
  7. GRB 101008A: SAO RAS optical observations
  8. GRB 101008: Swift/UVOT Upper Limits
  9. GRB 101008A: 1.23m CAHA optical observations
  10. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  11. GRB 101008A: Swift detection of a burst
  12. Refined analysis shows Swift Trigger 435520 is not a GRB
  13. Swift Trigger 435520 is probably not a GRB
  14. GRB 100924A: Suzaku WAM observation of the prompt emission
  15. GRB 100928A, Swift-BAT refined analysis
  16. GRB 100924A: Fermi GBM observation
  17. GRB 100928A: Swift detection of a burst
  18. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  19. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  20. GRB 100925A / MAXI J1659-152: SARA-S Observations
  21. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  22. GRB 100925A/MAXI J1659-152 - NOT optical observations
  23. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  24. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  25. GRB100925A UVOT afterglow
  26. GRB 100924A: GROND detection of an optical/NIR afterglow
  27. GRB 100925A: Swift detection of a burst
  28. GRB 100924A: Swift-BAT refined analysis
  29. GRB 100924A: Swift detection of a burst
  30. GRB 100917A: TAROT La Silla observatory optical observations
  31. GRB 100915A: TAROT Calern observatory optical observations
  32. GRB100906A: Ashra-1 observation of early optical emission
  33. GRB 100916A: Fermi GBM detection
  34. GRB 100917A: Swift-BAT refined analysis
  35. GRB 100917A: Swift detection of a burst
  36. GRB100915A: MITSuME Ishigakijima Optical upper limits
  37. GRB 100915B: GRT Optical Observation
  38. GRB 100915A: GRT Optical Observation
  39. GRB 100915B: Fermi GBM observation
  40. GRB 100915A: Correction to Swift-BAT refined analysis
  41. GRB 100915A: Swift/UVOT Upper Limits
  42. GRB 100915A: Swift-BAT refined analysis
  43. GRB 100915A: Swift-XRT refined analysis
  44. GRB 100915A: Swift detection of a likely burst
  45. GRB 100910A: Fermi GBM detection
  46. Swift-BAT trigger 433953 is not a burst
  47. Swift BAT Trigger 433953 probably not a GRB
  48. GRB100909A: MITSuME Ishigakijima Optical upper limits
  49. GRB 100909A: Swift/UVOT observations
  50. GRB 100901A: optical observations in Mondy and R-light curve
  51. GRB 100909A: Swift-XRT refined analysis
  52. GRB 100909A: Faulkes Telescope North afterglow candidate
  53. GRB 100909A: ROTSE-III Optical Limits
  54. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  55. GRB 100909A: Swift target of opportunity observation
  56. GRB100906A: detection at 15GHz
  57. GRB100906A: R band observations
  58. Konus-Wind observation of GRB 100906A
  59. GRB100906A: non-detection at 15GHz
  60. GRB 100906A: Fermi GBM observation
  61. GRB 100906A: Swift-XRT refined analysis
  62. GRB 100906A: Swift/UVOT Observations
  63. GRB 100905A: Swift/UVOT Upper Limits
  64. GRB 100901A: TLS observations, SDSS calibration, decay slope
  65. GRB 100906A: MASTER preliminary prompt+afterglow lc
  66. GRB 100906A: Swift-BAT refined analysis
  67. GRB 100906A: UKIRT zYJHK Observation
  68. GRB 100906A: MASTER preliminary polarization prompt light curve
  69. GRB 100906A : Faulkes Telescope North optical observations
  70. GRB 100906A: MASTER early OT observations
  71. GRB 100906A: Swift detection of a burst with an optical afterglow
  72. GRB 100829A: MASTER optical observations
  73. GRB 100905A: Swift-XRT refined analysis.
  74. GRB 100905A: UKIRT zJHK Observation
  75. GRB 100905A: Swift-BAT refined analysis
  76. GRB100904A: BOOTES-3 Upper Limit
  77. GRB 100905A: MASTER Prompt Optical Observations
  78. GRB 100905A: Faulkes Telescope North observations
  79. GRB 100905A: Swift detection of a burst
  80. GRB 100902A: UKIRT JK Observation
  81. GRB 100902A: GROND observations; afterglow candidate
  82. GRB 100901A: UKIRT zYJHK Observation
  83. GRB 100904A: Swift-BAT refined analysis
  84. GRB 100904A: Swift detection of a burst
  85. GRB 100902A: Swift-BAT refined analysis
  86. IPN Triangulation of the very bright GRB 100829A
  87. GRB 100901A: Lightbuckets Optical Observations
  88. Tentative redshift of GRB100902A from Swift-XRT data
  89. GRB 100902A: Swift XRT refined analysis
  90. GRB 100902A: Swift/UVOT Upper Limits
  91. GRB 100901A: TLS Observations: Break?
  92. GRB 100902A: MASTER Prompt Optical Observations
  93. GRB 100902A: Faulkes Telescope South observations
  94. GRB 100902A: MASTER Optical Early Limit
  95. GRB 100902A: Swift detection of a burst
  96. GRB 100901A: ROTSE-III Detection
  97. GRB 100901A: MASTER optical flare at 420s discovery
  98. GRB 100901A: Vega telescope optical afterglow observation
  99. Swift/UVOT Observations of GRB100901A
  100. GRB 100901A: SARA-N observations

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